How (Arduino+two xbee pro )-Rx.connected with ..(Arduino+one xbee pro)Tx .?

i have some problem about how receiving data by using two XPB24Z7 'xbee pro'
Note : am using SoftwareSerial.h to can connect the two xbee to one arduino 'uno' and using more than Tx and Rx at the arduino
,they are connected to same arduino 'uno' and data transmit from third xbee pro connected to another arduino 'uno' or pc
arduino code for Rx

#include <SoftwareSerial.h>

SoftwareSerial mySerial1(10, 11); // RX, TX
SoftwareSerial mySerial2(2, 3); // RX, TX
void setup() {

Serial.begin(9600);
mySerial1.begin(9600);
mySerial2.begin(9600);
pinMode(13, OUTPUT); //set pin 13 as output
}

void loop() {
// mySerial1.println("Hello, world?");
// delay(1000);

while(mySerial1.available()){ //is there anything to read?
char getData = mySerial1.listen(); //if yes, read it
if(getData == 'a'){
Serial.println('M1');
digitalWrite(13, HIGH);
delay(200);
}else if(getData == 'b'){
digitalWrite(13, LOW);
Serial.println('H1');
}
}
}

Out of the box, the XBees are capable of simple two-station data exchange ( A-->B, A<--B ).

To have 3 XBees requires configuring them for networking, as a "star" ( A-->B, A<--B; A-->C, A<--C )